staging/nvec: update TODO

replace old/implemented items with new todo list

Signed-off-by: Marc Dietrich <marvin24@gmx.de>
Link: https://lore.kernel.org/r/20240218212557.22836-2-marvin24@gmx.de


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>